Yealink SIP-T40G Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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Related Topic
DHCP Provision Configuration
DHCP Option 42, Option 2 and Option 100
Yealink phones support using the NTP server address offered by DHCP.
DHCP option 42 is used to specify a list of NTP servers available to the client by IP address. NTP servers should be
listed in order of preference.
DHCP option 2 is used to specify the offset of the client’s subnet in seconds from Coordinated Universal Time
(UTC).
DHCP option 100 is used to specify the timezone information (time zone and daylight-saving offset). The priority is
as follows: option 100 > option 2.
Related Topic
NTP Settings
DHCP Option 12
You can specify a hostname for the phone when using DHCP. The DHCP client uses option 12 to send a pre-
defined hostname to the DHCP registration server.
See RFC 1035 for character set restrictions.
Topic
DHCP Option 12 Hostname Configuration
DHCP Option 12 Hostname Configuration
The following table lists the parameter you can use to configure DHCP option 12 hostname.
Parameter
static.network.dhcp_host_name
[1]
<y0000000000xx>.cfg
Description
It specifies a hostname for the phone when using DHCP.
Permitted
Values
String within 99 characters
Default
For T57W phones: SIP-T57W.
For T54W phones: SIP-T54W.
For T53W phones: SIP-T53W.
For T53 phones: SIP-T53.
For T48U phones: SIP-T48U.
For T48G phones: SIP-T48G.
For T48S phones: SIP-T48S.
For T46U phones: SIP-T46U.
For T46G phones: SIP-T46G.
For T46S phones: SIP-T46S.
For T43U phones: SIP-T43U.
For T42G phones: SIP-T42G.
For T42S phones: SIP-T42S.
For T42U phones: SIP-T42U.

Yealink SIP-T40G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Wall mountable	Yes
Wi-Fi	No
Security algorithms	AES, HTTPS, SSL/TLS
Networking standards	IEEE 802.3af
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	FTP, TFTP, HTTP, HTTPS
Voice codecs	G.711, G.711a, G.711u, G.722, G.726, G.729ab
RJ-11 ports quantity	1
Ethernet LAN (RJ-45) ports	2
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	1.6 W
Certification	CE, FCC, ISO 9001
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 90 %
Volume control	Digital
Display diagonal	2.3 \
Display resolution	132 x 64 pixels
Lines quantity	3 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	3
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	175 mm
Width	212 mm
Height	54 mm